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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/statfs.h> | |
23 | ||
24 | #include "strv.h" | |
25 | #include "utf8.h" | |
26 | #include "btrfs-util.h" | |
27 | #include "image.h" | |
28 | #include "bus-label.h" | |
29 | ||
30 | Image *image_unref(Image *i) { | |
31 | if (!i) | |
32 | return NULL; | |
33 | ||
34 | free(i->name); | |
35 | free(i->path); | |
36 | free(i); | |
37 | return NULL; | |
38 | } | |
39 | ||
40 | static int add_image( | |
41 | Hashmap *h, | |
42 | ImageType t, | |
43 | const char *name, | |
44 | const char *path, | |
45 | bool read_only, | |
46 | usec_t mtime, | |
47 | usec_t btime) { | |
48 | ||
49 | _cleanup_(image_unrefp) Image *i = NULL; | |
50 | int r; | |
51 | ||
52 | assert(h); | |
53 | assert(t >= 0); | |
54 | assert(t < _IMAGE_TYPE_MAX); | |
55 | assert(name); | |
56 | ||
57 | i = new(Image, 1); | |
58 | if (!i) | |
59 | return -ENOMEM; | |
60 | ||
61 | i->type = t; | |
62 | i->read_only = read_only; | |
63 | i->mtime = mtime; | |
64 | i->btime = btime; | |
65 | ||
66 | i->name = strdup(name); | |
67 | if (!i->name) | |
68 | return -ENOMEM; | |
69 | ||
70 | if (path) { | |
71 | i->path = strdup(path); | |
72 | if (!i->path) | |
73 | return -ENOMEM; | |
74 | } | |
75 | ||
76 | r = hashmap_put(h, i->name, i); | |
77 | if (r < 0) | |
78 | return r; | |
79 | ||
80 | i = NULL; | |
81 | return 0; | |
82 | } | |
83 | ||
84 | int image_discover(Hashmap *h) { | |
85 | const char *path; | |
86 | int r; | |
87 | ||
88 | assert(h); | |
89 | ||
90 | FOREACH_STRING(path, "/var/lib/container", "/var/lib/machine") { | |
91 | _cleanup_closedir_ DIR *d = NULL; | |
92 | struct dirent *de; | |
93 | ||
94 | d = opendir(path); | |
95 | if (!d) { | |
96 | if (errno == ENOENT) | |
97 | return 0; | |
98 | ||
99 | return -errno; | |
100 | } | |
101 | ||
102 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
103 | struct stat st; | |
104 | ||
105 | if (STR_IN_SET(de->d_name, ".", "..")) | |
106 | continue; | |
107 | ||
108 | /* Temporary files for atomically creating new files */ | |
109 | if (startswith(de->d_name, ".#")) | |
110 | continue; | |
111 | ||
112 | if (string_has_cc(de->d_name, NULL)) | |
113 | continue; | |
114 | ||
115 | if (!utf8_is_valid(de->d_name)) | |
116 | continue; | |
117 | ||
118 | if (hashmap_contains(h, de->d_name)) | |
119 | continue; | |
120 | ||
121 | /* We explicitly *do* follow symlinks here, | |
122 | * since we want to allow symlinking trees | |
123 | * into /var/lib/container/, and treat them | |
124 | * normally. */ | |
125 | if (fstatat(dirfd(d), de->d_name, &st, 0) < 0) { | |
126 | if (errno == ENOENT) | |
127 | continue; | |
128 | ||
129 | return -errno; | |
130 | } | |
131 | ||
132 | if (S_ISDIR(st.st_mode)) { | |
133 | ||
134 | /* btrfs subvolumes have inode 256 */ | |
135 | if (st.st_ino == 256) { | |
136 | _cleanup_close_ int fd = -1; | |
137 | struct statfs sfs; | |
138 | ||
139 | fd = openat(dirfd(d), de->d_name, O_CLOEXEC|O_NOCTTY|O_DIRECTORY); | |
140 | if (fd < 0) { | |
141 | if (errno == ENOENT) | |
142 | continue; | |
143 | ||
144 | return -errno; | |
145 | } | |
146 | ||
147 | if (fstatfs(fd, &sfs) < 0) | |
148 | return -errno; | |
149 | ||
150 | if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)) { | |
151 | usec_t btime = 0; | |
152 | int ro; | |
153 | ||
154 | /* It's a btrfs subvolume */ | |
155 | ||
156 | ro = btrfs_subvol_is_read_only_fd(fd); | |
157 | if (ro < 0) | |
158 | return ro; | |
159 | ||
160 | /* r = btrfs_subvol_get_btime(fd, &btime); */ | |
161 | /* if (r < 0) */ | |
162 | /* return r; */ | |
163 | ||
164 | r = add_image(h, | |
165 | IMAGE_SUBVOLUME, | |
166 | de->d_name, | |
167 | path, | |
168 | ro, | |
169 | 0, | |
170 | btime); | |
171 | ||
172 | if (r < 0) | |
173 | return r; | |
174 | ||
175 | continue; | |
176 | } | |
177 | } | |
178 | ||
179 | /* It's just a normal directory. */ | |
180 | ||
181 | r = add_image(h, | |
182 | IMAGE_DIRECTORY, | |
183 | de->d_name, | |
184 | path, | |
185 | false, | |
186 | 0, | |
187 | 0); | |
188 | if (r < 0) | |
189 | return r; | |
190 | ||
191 | } else if (S_ISREG(st.st_mode) && | |
192 | endswith(de->d_name, ".gpt")) { | |
193 | ||
194 | /* It's a GPT block device */ | |
195 | ||
196 | r = add_image(h, | |
197 | IMAGE_GPT, | |
198 | de->d_name, | |
199 | path, | |
200 | !!(st.st_mode & 0111), | |
201 | timespec_load(&st.st_mtim), | |
202 | 0); | |
203 | if (r < 0) | |
204 | return r; | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | void image_hashmap_free(Hashmap *map) { | |
213 | Image *i; | |
214 | ||
215 | while ((i = hashmap_steal_first(map))) | |
216 | image_unref(i); | |
217 | ||
218 | hashmap_free(map); | |
219 | } | |
220 | ||
221 | char *image_bus_path(const char *name) { | |
222 | _cleanup_free_ char *e = NULL; | |
223 | ||
224 | assert(name); | |
225 | ||
226 | e = bus_label_escape(name); | |
227 | if (!e) | |
228 | return NULL; | |
229 | ||
230 | return strappend("/org/freedesktop/machine1/image/", e); | |
231 | } | |
232 | ||
233 | static const char* const image_type_table[_IMAGE_TYPE_MAX] = { | |
234 | [IMAGE_DIRECTORY] = "directory", | |
235 | [IMAGE_SUBVOLUME] = "subvolume", | |
236 | [IMAGE_GPT] = "gpt", | |
237 | }; | |
238 | ||
239 | DEFINE_STRING_TABLE_LOOKUP(image_type, ImageType); |